EE 225D LECTURE ON SYNTHETIC AUDIO. University of California Berkeley
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1 University of California Berkeley College of Engineering Department of Electrical Engineering and Computer Sciences Professors : N.Morgan / B.Gold EE225D Synthetic Audio Spring,1999 Lecture 2 N.MORGAN / B.GOLD LECTURE 2 2.1
2 a) Black Board Acoustic Tube. Vocal Cords Vocal Tract Filter (Time Variable) Air Pressure from Lungs Source Excitation Modulation Tongue changes tube shape and resonant frequencies. There could be non-linear activity due to turbulence and source - Filter Interactions. b) Trumpet has more or less the same model (- excitation) is created by lip vibration that produce pressure waves (- acoustic). N.MORGAN / B.GOLD LECTURE 2 2.2
3 Figure 2.1 : Wheatstone Speaking Machine (after Von Kempelen) N.MORGAN / B.GOLD LECTURE 2 2.3
4 Important Features on Wheatstone Speaking Machine (after Von Kempelen). 1. Vibrating Reed to Simulate Vocal cords. 2. Nasal Passage. 3. Bellows for producing pressure. 4. Leather Vocal Tract Question : How is S or Sh produced? N.MORGAN / B.GOLD LECTURE 2 2.4
5 Figure 2.2 : Riesz s Speaking Machine N.MORGAN / B.GOLD LECTURE 2 2.5
6 Important Points : a) First Electronic Synthesizer b) Long Period of Operator Training c) Filter Bank to Emulate Vocal Tract d) Relation to Human Voice Production Figure 2.4 : Sketch of the Voder. a) V-UV explicit b) Pitch controlled by pedal. c) 10 Filters d) Special keys for consonants. N.MORGAN / B.GOLD LECTURE 2 2.6
7 Operating Control Microphone Testing equipment and Clock Wrist Bar Pitch Pedal Figure 2.4 : The Voder N.MORGAN / B.GOLD LECTURE 2 2.7
8 Voder Console N.MORGAN / B.GOLD LECTURE 2 2.8
9 N.MORGAN / B.GOLD LECTURE 2 2.9
10 a) noise pulse + Filters Controls All Sounds were produced from this configuration. Nasals were produced by key switching on the low filters. N.MORGAN / B.GOLD LECTURE
11 Periodic Excitation Vowels, Glides, Liquids r, q, l, y Formants Filters Noise Source Voiceless Fricative s, sh, f, th. z, zh, v, th e Shared be buzz + hiss Noise Source Stop or Plosive Sounds t-d p-b k-go High Frequency Burst. N.MORGAN / B.GOLD LECTURE
12 Figure 2.6 : Lesson 1 of Voder Instructions N.MORGAN / B.GOLD LECTURE
13 Simple Example she saw me. Keys 7 & 8 1 & , 8 Wrist Bar up down up down down down Lesson 1 of Voder Instruction Exercises Do the Voder Program for See me Seesaw. Do the Voder Program for Shake it off. N.MORGAN / B.GOLD LECTURE
14 Figure 2.5 : Voder Controls N.MORGAN / B.GOLD LECTURE
15 Music Machine 1. Barrel Organs [ Pure Synthesis - no Analysis ] (Music Boxes) 2. Player Pianos [ melography ] Punched Paper Tape on Cards Made by a master performer Babbage : 1BM ( 50 s ) Note : Player pianos were very popular about a century ago. N.MORGAN / B.GOLD LECTURE
16 Figure 2.9 : Seventeenth-Century Drawing of a Water-Powered Barrel Organ. N.MORGAN / B.GOLD LECTURE
17 Alvin Fu s Bosendorfer Alvin wanted to enhance an old piano roll by Rachmoninoff by using it to control the Bosendorfer. Telharmonium Additive Synthesis Still used in both Speech and Music. N.MORGAN / B.GOLD LECTURE
18 Figure 2.10 : Clara Rockmore at the Theremin. N.MORGAN / B.GOLD LECTURE
19 Classification of the Speech Sounds N.MORGAN / B.GOLD LECTURE
20 Voder Demo 20 separate sounds. She saw me. - She saw me. - She saw me. - She saw me. Greetings everybody G r ee t i ng s BK1 2, 5, 6 1, 8 13, k, 3 2, 8 18, 1 9 high pitch low pitch Mary had a little lamb. Ha Ha Ha Yes, I feel very old. Speech transformations N.MORGAN / B.GOLD LECTURE
21 Telephone Band Vowel Vibrator Singing Concentration - 13 Sounds - 5 Wrist bar 1 Year of constant practice Foreign Speech - Parlez vouz francais. Cow, Pig, Alphabet Practical Applications N.MORGAN / B.GOLD LECTURE
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University of California Berkeley College of Engineering Department of Electrical Engineering and Computer Sciences Professors : N.Morgan / B.Gold EE225D Speech Synthesis Spring,1999 Lecture 23 N.MORGAN
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